Journal
MATERIALS ADVANCES
Volume 3, Issue 17, Pages 6887-6896Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2ma00370h
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Funding
- National Natural Science Foundation of China [21878007, 21838007]
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In this study, a series of highly efficient bifunctional electrocatalytic composites, Ni2Fe1-LDH/rGO/NF, with excellent OER and HER performance, particularly for overall water splitting, were prepared. The unique array-like nanosheet framework, synergy between Ni2Fe1-LDH and rGO, and vertically staggered growth of Ni2Fe1-LDH on the rGO/NF substrate contribute to its outstanding electrocatalytic performance.
Herein, we have prepared a series of highly efficient bifunctional electrocatalytic composites, NixFe1-LDH/rGO/NF (x = 3, 2, 1), with vertically staggered NiFe-LDH nanosheets grown on nickel foam uniformly modified with reduced graphene oxide through a simple green hydrothermal method. The as-obtained nanosheet-array-like composites exhibit excellent performance for the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER). In particular, Ni2Fe1-LDH/rGO/NF requires 228 and 109 mV for the OER and HER in 1 M KOH at 10 mA cm(-2), respectively. Moreover, when it is directly used as both cathode and anode at the same time for overall water splitting, it only requires 1.62 V to achieve 10 mA cm(-2). The as-prepared Ni2Fe1-LDH/rGO/NF composite shows excellent electrocatalytic performance, which is ascribed to the unique array-like nanosheet framework with exposed paths, the synergy between Ni2Fe1-LDH and rGO, and the vertically staggered growth of Ni2Fe1-LDH on the rGO/NF substrate improving the stability. This strategy can also be applied to create composites of other metal compositions with a nanosheet-array-like structure as efficient electrocatalysts for the development of efficient clean renewable energy.
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